Ashley Fiolek retired too young

Ashley Fiolek was the world’s best professional motocross racer.
Not yet at the age of 20, she won world championships in
2008, 2009, 2011, and 2012. She was at the top of her world;
she was popular with fans and with sponsors. All of a sudden
she retired, with vague plans to race cars, but it was not
to be.

Why did she retire so young? Possibly because she was tired
of going to the hospital so many times with racing injuries!